As the now-peaceful region thrived, Kyurem felt his isolation grow stronger. The dragon longed to connect with the outside world again, but knew he was considered dead to the world. As far as the world knew, he vanished without a trace.
As the nearby village grew, so did his loneliness and envy.
Under the cover of darkness, he frequented the village, using his newfound ice powers to immobilize stray humans and pokémon. He brought some to his crater, wanting a few companions. The "guests" fled home, and soon the village enclosed itself in a wall. Kyurem became isolated once more.